An AI assistant built into Acrobat that summarizes PDFs and answers questions about them.
Paraphraser.io
Freemium
A free online paraphrasing tool with several rewriting modes and a built-in checker.
Scribbr Paraphrasing Tool
Freemium
A student-friendly paraphraser from Scribbr with adjustable modes and synonym control.
Spinbot
Freemium
A no-frills article spinner and paraphraser that rewrites text in seconds.
Prepostseo
Freemium
A collection of writing and SEO tools including a paraphraser, plagiarism checker and summarizer.
AI or Not
Freemium
Checks whether an image, audio clip or video was made by AI.
Copy.ai
Freemium
A go-to-market AI platform for sales and marketing content and workflows.
Undetectable AI
Freemium
A tool that rewrites AI-generated text to sound more human and checks it against detectors.
WriteHuman
Freemium
Rewrites AI text into a more natural human voice and shows how detectors may score it.
GPTZero
Freemium
One of the first AI text detectors, widely used by teachers and publishers.
Originality.ai
Paid
AI detection and plagiarism checking built for publishers, marketers and SEO teams.
Copyleaks
Freemium
Plagiarism and AI content detection used by schools and enterprises worldwide.
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